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authorH.J. Lu <hjl.tools@gmail.com>2017-06-05 08:28:01 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-06-05 08:28:13 -0700
commit9cd30491dd6d9d4c5e9372d7a5c75f78f3a11260 (patch)
tree9bdc9658b03a2c6038871f6b19eff9838379c382 /include/wchar.h
parent30cb625a21bc7ad450fdc45d1f682e2b27c353de (diff)
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x86: Add macros to implement ifunce selection in C
These macros are used to implement ifunc selection in C.  To implement
an ifunc function, foo, which returns the address of __foo_sse2 or
__foo_avx2:

   __foo_avx2:

   #define foo __redirect_foo
   #define __foo __redirect___foo
   #include <foo.h>
   #undef foo
   #undef __foo
   #define SYMBOL_NAME foo
   #include <init-arch.h>

   extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
   extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;

   static inline void *
   foo_selector (void)
   {
     if (use AVX2)
      return OPTIMIZE (avx2);

     return OPTIMIZE (sse2);
   }

   libc_ifunc_redirected (__redirect_foo, foo, foo_selector ());

	* sysdeps/x86/init-arch.h (PASTER1): New.
	(EVALUATOR1): Likewise.
	(PASTER2): Likewise.
	(EVALUATOR2): Likewise.
	(REDIRECT_NAME): Likewise.
	(OPTIMIZE): Likewise.
	(IFUNC_SELECTOR): Likewise.
Diffstat (limited to 'include/wchar.h')
0 files changed, 0 insertions, 0 deletions